SI units, measuring instruments, significant figures and basic dimensional ideas at Class 8-10 level.
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Q1 · Measurement and Units · MEDIUM
A vernier caliper has 20 divisions on its vernier scale which coincide with 19 main scale divisions. If each main scale division is 1 mm, what is the least count?
Q2 · Measurement and Units · HARD
The percentage error in measuring radius of a sphere is 2%. What is the percentage error in calculating its volume?
Q3 · Measurement and Units · EASY
The SI unit of luminous intensity is:
Q4 · Measurement and Units · MEDIUM
A student measures the thickness of a glass plate using a screw gauge with a least count of 0.01 mm. The main scale reading is 3 mm and the 42nd circular scale division coincides with the reference line. If the screw gauge has a positive zero error of 0.03 mm, what is the corrected thickness of the glass plate?